JP2014078390A - Earphone cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earphone cable which endures external damage such as rubbing and press flaws, on which a folding habit scarcely remains even when subjected to storage operation by repeated bending, and with which a feeling of beauty is given.SOLUTION: An earphone cable has: an insulating wire 2 including a high tension fiber 5, spirally wound wires 7, 8 formed by spirally winding a conductor 6 on an outer periphery of the high tension fiber 5, and an insulator 9 to cover outer peripheries of the spirally wound wires 7, 8; and a jacket 4 covering the outer periphery of twisted insulating wires 2. The insulator 9 is composed of a natural colored fluororesin, the jacket 4 is composed of a natural colored nylon resin or an ultraviolet resistant PVC. When a spirally winding outer diameter of the spirally wound wires 7, 8 is represented by d, an outer diameter of the conductor 6 is represented by d, and d-dis represented by p, a spirally winding pitch p of the conductor 6 is made to satisfy 8×p≤p≤12×p.

Description

  The present invention relates to an earphone cable that is strong against bending and is not easily creased and that allows the shine of a conductor surface plating layer to be seen through and gives an aesthetic feeling like an accessory.

  In recent years, with the popularization and evolution of small electronic devices that can easily download music, round earphone cables with a variety of designs have been used. A general-purpose earphone cable has a core (insulated wire) coated with polyethylene (PE) or polyvinyl chloride (PVC) resin as an insulator around the periphery of high-tensile fibers and a plurality of conductors. After the final twisting, the outer periphery is roundly coated with a polyvinyl chloride (PVC) resin with a uniform thickness.

  As the earphone cable, one having a core of 2 to 4 cores is usually used. For example, two 2-core (+,-2-pole) core cables are used as the cable on the earphone main body side to be inserted into both ears, and the cable is connected to the two 2-core core cables. As a cable on the terminal side that is integrated into a small electronic device and connected to a small electronic device, a 3-core (+, +, −3 poles) or a 4-core (+, +, −, −4 poles) core cable is used.

  The earphone cable looks like external wiring, and is connected to the earphone body inserted in both ears from the terminal connected to the small electronic device, so if it gets scratched or creased, the aesthetics will be greatly impaired . Moreover, when exposed to ultraviolet rays by sales at stores, outdoor use, etc., PVC tends to turn yellow, so the aesthetics are easily impaired. Further, in order to make yellowing inconspicuous, it is necessary to use PVC colored in black or white, which lacks design.

  On the other hand, since the earphone cable is usually folded and stored, it is required that the earphone cable is thin and soft and no creases remain.

  Patent Document 1 describes a cord in which conductors composed of a plurality of copper wires are each covered with a braid knitted with lame yarn, and further covered with an external insulator such as colorless or colored transparent vinyl. ing.

Registered Utility Model No. 3051936

  By the way, the cord described in Patent Document 1 can give aesthetics and increase tensile strength and bending strength by providing a braid knitted with lame yarn, but because it is coated with PVC resin, When crushing with a sharp object, it is bent with a smaller bending radius, hooked, or rubbed, there is a problem that the surface is prone to folds, undulations, and scratches, and the aesthetics are greatly impaired. . Moreover, since PVC is easily yellowed by ultraviolet rays, it is easy to impair the aesthetics.

  In addition, the creases generated in the storing operation by repeated folding tend to remain in the appearance as they are, and there is a problem that the kinks and disconnection occur over time.

  Accordingly, an object of the present invention is to provide an earphone cable that solves the above-mentioned problems, is resistant to external damage such as rubbing and pushing, and is less likely to retain creases even during storage operations by repeated bending, and can provide an aesthetic feeling. It is in.

In order to solve the above-described problems, the present invention provides a high-strength fiber, a horizontal winding formed by winding a conductor on the outer periphery of the high-tensile fiber, and an insulator coated on the outer periphery of the horizontal winding. , And a jacket coated on the outer periphery of the insulated wires twisted together, wherein the insulator is made of natural color fluororesin, and the jacket is made of natural color nylon resin or UV-resistant PVC. When the horizontal winding outer diameter of the horizontal winding is d ₁ , the outer diameter of the conductor is d _2, and d ₁ -d ₂ is p _d , the horizontal winding pitch p of the conductor is p = (8-12) was assumed to be a × p _d.

  The conductor is plated with silver, and the outer diameter of the conductor is preferably 0.05 mm or more and 0.08 mm or less.

  The conductor is horizontally wound in two layers and in the same direction on the high-tensile fiber, and the insulation wire is formed to have an outer diameter of 0.7 mm or less and twisted 2 to 4, and the diameter of the jacket is 2 It is preferable that the thickness of the thinnest portion of the jacket is 0.3 mm or less.

  The jacket may be formed by solid extrusion.

  The insulator may be made of any one of ETFE, PFA, and FEP.

  According to the present invention, it is strong against trauma such as rubbing and pressing, and it is difficult for creases to remain even in a storing operation by repeated bending, and it is possible to give aesthetics.

It is sectional drawing of the earphone cable which concerns on this Embodiment. It is sectional drawing of the earphone cable which shows other embodiment. It is sectional drawing of the earphone cable which shows other embodiment. It is sectional drawing of an insulated wire. It is principal part sectional explanatory drawing of an insulated wire, (a) is explanatory drawing of the inner layer horizontal winding, (b) is explanatory drawing of the outer layer horizontal winding.

  An earphone cable according to the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, an earphone cable 1 includes a stranded wire 3 twisted at a constant pitch with two insulated wires 2 as core wires, and a natural color (transparent) jacket 4 covered on the outer periphery of the stranded wire 3. With.

  As shown in FIG. 4, the insulated wire 2 includes a high-strength fiber 5, horizontal windings 7 and 8 formed by winding the conductor 6 on the outer periphery of the high-tensile fiber 5 (winding spirally), A natural color (transparent) insulator 9 is provided on the outer periphery of the horizontal windings 7 and 8.

  The high-tensile fiber 5 is made of an aramid fiber of 200 dtex to 400 dtex. Since the aramid fiber having low elongation and excellent tensile resistance is positioned at the center of the conductor 6, the tensile tension is not directly applied to the conductor 6, the insulator 9, and the jacket 4, and it can withstand repeated tension. And by winding a plurality of copper wires around an aramid fiber, the conductor 6 is soft and can withstand repeated bending and folding.

  The conductors 6 constituting the horizontal windings 7 and 8 each have a tensile strength of 20 N or more and are made of a soft silver-plated copper wire. Since the insulator 9 and the jacket 4 have a transparent natural color, the brightness of the silver plating of the conductor 6 can be seen through from the surface appearance of the earphone cable 1 and can give a aesthetic feeling. Further, the conductor 6 is set to 0.05 to 0.08 mm from the balance between the bending resistance and the acoustic characteristics of the earphone cable 1. If the conductor diameter is less than 0.05 mm, the conductor resistance increases, so the acoustic characteristics deteriorate. If the conductor diameter exceeds 0.08 mm, the earphone cable 1 becomes hard, and therefore, if it is repeatedly bent, it is easy to crease, and further, it becomes easy to kink or break.

  The horizontal windings 7 and 8 are formed in two layers on the outer periphery of the high-tensile fiber 5 so that the central aramid fiber cannot be seen from the surface. The inner layer horizontal winding 7 consists of six conductors, and the outer layer horizontal winding 8 consists of thirteen conductors 6. The conductors 6 constituting the lateral windings 7 and 8 are respectively laterally wound in the same direction, and the winding direction of the inner layer and the winding direction of the outer layer are the same. As a result, the insulating wire 2 is not easily creased.

As shown in FIG. 5A, the horizontal winding outer diameter of the inner layer horizontal winding 7 is d ₁₁ , the outer diameter of the inner layer conductor 6 is d _21, and d ₁₁ -d ₂₁ (each of the inner layer conductors 6). When the diameter of the circle connecting the centers is p _d1 , the pitch p ₁ of the horizontal winding 7 of the inner layer is set to be the following expression (1).
8 × p _d1 ≦ p ₁ ≦ 12 × p _d1 (1)

Further, as shown in FIG. 5B, the horizontal winding outer diameter of the outer layer horizontal winding 8 is d ₁₂ , the outer diameter of the outer layer conductor 6 is d _22, and d ₁₂ -d ₂₂ (each conductor of the outer layer). When the diameter of the circle connecting the centers of 6 is defined as p _d2 , the pitch p ₂ of the horizontal winding 8 of the outer layer is set so as to satisfy the following formula (2) in consideration of the aesthetics and the bending resistance of the earphone cable 1. Has been.
8 × p _d2 ≦ p ₂ ≦ 12 × p _d2 (2)

When the horizontal winding pitch p ₂ is p ₂ <8 × p _d2 , the brightly shining portion becomes dense, so that the whole appears to shine uniformly. For this reason, it seems that the brightness is insufficient, and a sufficient aesthetic sense cannot be given. In addition, since the earphone cable 1 is hard, if it is repeatedly bent, it will be easy to crease, and further, it will be easy to kink or break.

When the horizontal winding pitch p ₂ is p ₂ > 12 × p _d2 , the brightly shining portion becomes rough, and thus a sufficient aesthetic feeling cannot be given.

  Further, the inner layer horizontal winding 7 and the outer layer horizontal winding 8 are set to have different pitches so that the aramid fibers can be seen through from the surface so as not to impair the aesthetics.

As described above, the silver-plated copper wire as the conductor 6 is horizontally wound at a constant pitch p ₂ so that the unevenness of the silver-plated copper wire appears at the pitch p ₂ in the longitudinal direction of the earphone cable 1. Therefore, since the light incident on the earphone cable 1 is three-dimensionally reflected on the surface of the silver plating conductor 6 and shines strongly at the pitch p ₂ described above, the earphone cable 1 that gives aesthetics can be obtained.

  As shown in FIGS. 1 and 4, the insulator 9 is made of a fluororesin that is excellent in bending resistance, crack resistance, and heat resistance and can be coated in a thin wall with a thickness of 0.06 mm to 0.15 mm. Specifically, the insulator 9 is made of a fluororesin such as ETFE, PFA, FEP or the like that is not fused with a nylon resin that is a material of the jacket 4 described later. The insulator 9 cannot be formed round when the thickness is less than 0.06 mm. Moreover, if the thickness of the insulator 9 exceeds 0.15 mm, the earphone cable 1 becomes thick. Therefore, a fluororesin such as ETFE, PFA, FEP, etc. that is excellent in bending resistance, crack resistance, heat resistance and not fused with nylon resin as a thin insulation coating having a thickness of 0.06 to 0.15 mm is used as the insulator 9 By applying to the above, it is possible to maintain the bending resistance while minimizing the outer diameter of the earphone cable 1.

Further, the twisted outer diameter of the strand 3 and D _1, when the outer diameter of one insulated wire and D _2, D ₁ -D ₂ (diameter of a circle connecting the centers of the insulated wire 2) was P _D The pitch P of the stranded wire 3 is set to be the following expression (3).
8 × P _D ≦ P ≦ 12 × P _D (3)

  Thereby, it is possible to prevent a crease due to repeated bending from remaining, and to give an aesthetic feeling.

  The insulated wire 2 is formed with an outer diameter of 0.7 mm or less so that the earphone cable 1 is hard and does not become heavy.

  The jacket 4 is made of a natural color nylon resin (for example, nylon 12 or the like) or UV resistant PVC. Nylon resin does not cause yellowing because it has stable characteristics against ultraviolet rays. Nylon resin does not harden or swell due to sebum or sweat, and the refractive index does not partially change. Therefore, the earphone cable 1 does not impair the aesthetics by using nylon resin for the jacket 4. The ultraviolet resistant PVC includes a polyester plasticizer and an ultraviolet absorber. Moreover, although general PVC may contain fillers, such as a calcium carbonate, the said ultraviolet-resistant PVC does not contain the said filler. The polyester plasticizer added to the UV-resistant PVC is hard to be extracted to the outside by sebum or sweat, the resin hardens when the plasticizer is removed, or moisture or oil enters the place where the plasticizer is removed. The resin does not swell. In addition, ultraviolet absorbers absorb ultraviolet rays to prevent yellowing of the resin, and fillers such as calcium carbonate are colored. Therefore, by adding no filler, the ultraviolet resistant PVC maintains transparency. Therefore, the earphone cable 1 does not impair the aesthetics by using the UV resistant transparent PVC. Moreover, since these jackets do not harden the jacket 4 due to sebum or sweat, it is difficult for creases due to repeated bending to occur.

  In addition, since the fluororesin insulator 9 has a high melting point and does not fuse with the nylon resin jacket 4, the insulator 9 is not pulled by the jacket 4 when it is repeatedly bent and bends independently. This makes it possible to maintain high bending characteristics. The heat resistance temperature of the nylon resin is 80 to 140 ° C, ETFE is 150 ° C, PFA is 250 ° C, and FEP is 200 ° C.

  Further, the jacket 4 is press-fitted without a gap to the strands of the stranded wire 3 and has a round outer periphery. The thickness of the thinnest place of the jacket 4 is 0.3 mm or less. By making such a thin wall thickness, the outer diameter of the entire earphone cable 1 can be reduced. If it exceeds 0.3 mm, the earphone cable 1 becomes hard, so that it is easy to crease, and further, it becomes easy to kink or break. Moreover, the transparency of resin will fall and the aesthetics will be impaired by becoming thick.

  The jacket 4 is preferably covered by full extrusion. By performing full extrusion, the resin is pressed into the strands of the stranded wire 3 without a gap, so that a round outer peripheral shape can be maintained even when bent. In addition, the refractive index of light changes depending on the air gap, and the way of shine does not change depending on the viewing angle, and the earphone cable 1 that shines evenly when viewed from anywhere can be obtained.

  The earphone cable 1 is formed to have an outer diameter of 2.2 mm or less so as not to be hard and heavy.

As described above, the high-strength fiber 5, the horizontal windings 7 and 8 formed by horizontally winding the conductor 6 around the outer periphery of the high-tensile fiber 5, and the insulator 9 covered on the outer periphery of the horizontal windings 7 and 8. And the jacket 4 covered on the outer periphery of the insulated wire 2 twisted together, the insulator 9 is made of natural color fluororesin, and the jacket 4 is made of natural color nylon resin or It is made of UV-resistant PVC, the horizontal winding outer diameter of the horizontal windings 7 and 8 is d ₁ (d ₁₁ or d ₁₂ ), the outer diameter of the conductor 6 is d ₂ (d ₂₁ or d ₂₂ ), and d ₁ −d _{When 2} is p _d (p _d1 or p _d2 ), the lateral winding pitch p (p ₁ or p ₂ ) of the conductor 6 is expressed by the following formula (4). In addition, creases are less likely to remain even in storage operations by repeated bending, and it is possible to give aesthetics.
8 × p _d ≦ p ≦ 12 × p _d (4)

  Since the conductor 6 is silver-plated and the outer diameter of the conductor 6 is 0.05 mm or more and 0.08 mm or less, it is possible to achieve both acoustic characteristics and resistance to repeated bending.

  The conductor 6 is wound in two layers on the high-tensile fiber 5 in the same direction, and the insulated wire 2 is formed to have an outer diameter of 0.7 mm or less, and 2 to 4 wires are twisted together. The diameter of the jacket 4 is 2 Since the thickness of the thinnest portion of the jacket 4 is 0.3 mm or less, the earphone cable 1 is soft and light and has excellent aesthetics.

  Since the jacket 4 is formed by solid extrusion, the resin can be press-fitted without a gap between the strands of the stranded wire 3, the shape can be stably maintained, and the earphone cable 1 having excellent aesthetics can be obtained.

  Since the insulator 9 is made of any one of ETFE, PFA, and FEP, it is possible to prevent fusion with the nylon resin jacket 4 and maintain high bending characteristics.

  The conductor 6 is horizontally wound in two layers around the high-tensile fiber 5, but may be horizontally wound in a single layer. Moreover, although the case where the earphone cable 1 is a two-core core cable in which two insulated wires 2 are twisted together has been described, the present invention is not limited to this. As shown in FIG. 2, the earphone cable 20 may be a three-core core cable in which three insulated wires 2 are twisted together. As shown in FIG. 3, the earphone cable 21 may be a four-core cable in which four insulated wires 2 are twisted together.

1 Earphone cable 2 Insulated wire 3 Stranded wire 4 Jacket 5 High tensile fiber 6 Conductor 7 Horizontal winding (inner layer)
8 Horizontal winding (outer layer)
9 Insulator

Claims (5)

An insulated wire comprising: a high-strength fiber; a laterally wound wire formed by laterally winding a conductor on the outer periphery of the high-tensile fiber; and an insulator coated on the outer periphery of the laterally wound wire; And a jacket coated on the outer periphery twisted together,
The insulator is made of natural color of fluororesin, the jacket is made of nylon resin or UV-resistant PVC natural color, the transverse winding outer diameter of the transverse winding and d _1, the outer diameter of the conductor and d ₂ , D ₁ −d ₂ is p _d , the horizontal winding pitch p of the conductor is
8 × p _d ≦ p ≦ 12 × p _d
Earphone cable characterized by being.   The earphone cable according to claim 1, wherein the conductor is plated with silver, and the outer diameter of the conductor is 0.05 mm or more and 0.08 mm or less.   The conductor is horizontally wound in two layers and in the same direction on the high-tensile fiber, and the insulation wire is formed to have an outer diameter of 0.7 mm or less and twisted 2 to 4, and the diameter of the jacket is 2 The earphone cable according to claim 2, wherein the thickness of the thinnest portion of the jacket is 0.3 mm or less.   The earphone cable according to claim 1, wherein the jacket is formed by solid extrusion.   The earphone cable according to claim 1, wherein the insulator is made of any one of ETFE, PFA, and FEP.

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